becoming one of the area's most popular. next our restaurant critic visits the restaurant >> later union station gets into the holiday spirit with activities for the whole family... break i mean, yeah, you could say it's an unusual hobby. and yeah, i've had people laugh at me, but i don't care. i just love collecting air. people always say the world is, like 80% water, right? that means the world has to be like 90% a&i. that's just science. think it's weird to collect air? you wouldn't think so if you saw what your lungs collect every time you breathe. people can make fun of me all they want, but i choose to see the glass half-full. ofir. protect your health with life-saving air quality updates from the american lung association. get our free "nsate of the air" app at lung.org. chicagos fulton river district is quickly becoming a hotbed for popular restaurants. and the latest addition, la sirena clandestina, is serving up its own take on some latin- inspired dishes. chicago tribune restaurant critic phil vettel says theyll fit right in. >> a dining hotspot... "the hidden mermaid"